CN103986185B - A kind of photovoltaic combining inverter with active power decoupling zero function - Google Patents
A kind of photovoltaic combining inverter with active power decoupling zero function Download PDFInfo
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- CN103986185B CN103986185B CN201410189850.0A CN201410189850A CN103986185B CN 103986185 B CN103986185 B CN 103986185B CN 201410189850 A CN201410189850 A CN 201410189850A CN 103986185 B CN103986185 B CN 103986185B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a kind of photovoltaic combining inverter with active power decoupling zero function, described photovoltaic combining inverter comprises main anti exciting converter, power decoupled converter, inverter circuit and output filter circuit; Present invention achieves the decoupling zero between photovoltaic combining inverter power output and output power of photovoltaic module, make to adopt the non-electrolytic capacitor of low capacity just can realize the DC voltage-stabilizing effect of photovoltaic module output at photovoltaic combining inverter direct current input side, improve MPPT maximum power point tracking (MPPT) efficiency of photovoltaic module; And instead of electrochemical capacitor with the non-electrolytic capacitor that reliability is high, solve photovoltaic combining inverter and cause owing to using electrochemical capacitor the difficult problem that inverter whole service life is lower; Can realize absorbing feedback to transformer leakage inductance energy simultaneously, and achieve the Sofe Switch of main anti exciting converter high-frequency work switching tube, improve the conversion efficiency of inverter.
Description
Technical field
The present invention relates to a kind of photovoltaic combining inverter, be specifically related to a kind of photovoltaic combining inverter with active power decoupling zero function.
Background technology
Solar energy is inexhaustible, and in the 21 century to green energy resource active demand, solar energy power generating will obtain fast development more.Along with the fast development of the grid-connected application of distributed photovoltaic and intelligent grid, family roof and commercial roof market are in quick growth.In middle-size and small-size photovoltaic parallel in system, directly the direct current energy that monolithic photovoltaic module exports be reverse into AC energy and inject the small-power photovoltaic combining inverter of electrical network, being called grid-connected Miniature inverter.Grid-connected Miniature inverter is particularly suitable for low-power applications occasion, Miniature inverter can realize component level monitoring, perform MPPT maximum power point tracking (MPPT) for each block assembly, the output of single component reduces or lost efficacy does not affect whole efficiency, guarantees that system effectiveness maximizes; Miniature inverter system is to the strong adaptability of actual environment, relatively low to the coherence request of photovoltaic module, installs, maintenance cost is low, and System Expansion flexibility is large, therefore obtains and studies widely.
In single-phase grid-connected photovoltaic power generation system, the power output of inverter changes with twice power frequency, and expect that the power output ripple of photovoltaic module is less, to ensure the normal work of photovoltaic module and higher MPPT maximum power point tracking efficiency, must need to add power decoupled device between input and output.Present stage, a kind of conventional power decoupled mode was direct current input side at photovoltaic combining inverter and the United Nations General Assembly's electrochemical capacitor, but electrochemical capacitor is a bottleneck in complete machine useful life.How eliminating electrochemical capacitor, replacing with the non-electrolytic capacitor of low capacity, high reliability is a new difficult point; On the other hand, adding power decoupling circuit will inevitably bring impact to overall efficiency, while solving power decoupled problem, therefore also need the high efficiency transformation problem paying close attention to photovoltaic combining inverter.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, the object of the present invention is to provide a kind of photovoltaic combining inverter with active power decoupling zero function, big capacity electrolyte capacitor is replaced with the non-electrolytic capacitor of high reliability, low capacity, to solve the problem of photovoltaic combining inverter reliability and useful life better, can effectively absorb fly-back transformer leakage inductance energy simultaneously, improve conversion efficiency.
In order to achieve the above object, the present invention adopts following technical scheme:
There is a photovoltaic combining inverter for active power decoupling zero function, comprise main anti exciting converter 20, power decoupled converter 10, first order filter capacitor C
o, inverter circuit 30 and output filter circuit 40; The output voltage of photovoltaic module is through a DC side input capacitance C in parallel with photovoltaic array output
into be connected with the input of main anti exciting converter 20, the input of power decoupled converter 10 respectively afterwards, the output of described main anti exciting converter 20 and the output of described power decoupled converter 10 be connected to each other and with first order filter capacitor C
oinput connect, described first order filter capacitor C
ooutput be connected with the input of inverter circuit 30, the output of described inverter circuit 30 is connected with the input of output filter circuit 40.
Described main anti exciting converter 20 comprises main anti exciting converter main switch S
m2, main anti exciting converter transformer T
2, main anti exciting converter secondary side exports rectifier diode D
3, main anti exciting converter active clamping switch tube S
c2with main anti exciting converter active clamp electric capacity C
c2; Described main anti exciting converter transformer T
2first side winding Same Name of Ends and the positive terminal of photovoltaic module output voltage and described DC side input capacitance C
inone end and described main anti exciting converter active clamping switch tube S
c2drain electrode be connected, described main anti exciting converter transformer T
2the non-same polarity of first side winding and described anti exciting converter main switch S
m2drain electrode and described main anti exciting converter active clamp electric capacity C
c2one end be connected, described main anti exciting converter active clamp electric capacity C
c2the other end and described main anti exciting converter active clamping switch tube S
c2source electrode be connected, described main anti exciting converter main switch S
m2source electrode and described DC side input capacitance C
inthe other end and described power decoupled converter main switch S
m1source electrode and the negative pole end of photovoltaic module output voltage be connected, described main anti exciting converter transformer T
2non-same polarity and the described main anti exciting converter secondary side of secondary side winding export rectifier diode D
3anode connect, described main anti exciting converter secondary side exports rectifier diode D
3negative electrode and described first order filter capacitor C
oone end be connected with described power decoupled converter 10 Circuit Fault on Secondary Transformer Same Name of Ends, described main anti exciting converter 20 secondary side winding Same Name of Ends and described first order filter capacitor C
othe other end and described inverter circuit 30 connect.
Described power decoupled converter 10 comprises power decoupled converter input diode D
s, leakage inductance energy feedback capacitor C
s, power decoupled converter main switch S
m1, power decoupled converter transformer T
1, power decoupled converter secondary side exports rectifier diode D
1, power decoupled converter secondary side output switch pipe S
d1, power decoupled converter decoupling switch pipe S
c1with power decoupled electric capacity C
c1; Described power decoupled converter input diode D
sanode and the positive terminal of photovoltaic module output voltage and described leakage inductance energy feedback capacitor C
sone end be connected, power decoupled converter input diode D
snegative electrode and described leakage inductance energy feedback capacitor C
sthe other end and described power decoupled converter transformer T
1same Name of Ends and described power decoupled converter decoupling switch pipe S
c1drain electrode be connected, described power decoupled converter transformer T
1the non-same polarity of first side winding and described power decoupled converter main switch S
m1drain electrode and described power decoupled electric capacity C
c1one end be connected, described power decoupled electric capacity C
c1the other end and described power decoupled converter decoupling switch pipe S
c1source electrode be connected, described power decoupled converter main switch S
m1source electrode and described DC side input capacitance C
inthe other end and described main anti exciting converter main switch S
m2source electrode and the negative pole end of photovoltaic module output voltage be connected, described power decoupled converter transformer T
1the non-same polarity of secondary side winding and described power decoupled converter secondary side output switch pipe S
d1drain electrode connect, described power decoupled converter secondary side output switch pipe S
d1source electrode and power decoupled converter secondary side export rectifier diode D
1negative electrode be connected, described power decoupled converter secondary side exports rectifier diode D
1anode be connected with described main anti exciting converter 20 secondary winding Same Name of Ends, described power decoupled converter transformer T
1secondary side winding Same Name of Ends and described main anti exciting converter secondary side export rectifier diode D
3negative electrode and described inverter circuit 30 connect.
Described inverter circuit 30 comprises the first inverter thyristor S
1, the second inverter thyristor S
2, the 3rd inverse switch pipe S
3with the 4th inverse switch pipe S
4; Described first inverter thyristor S
1anode and described second thyristor S
2anode link together and with first order filter capacitor C
oone end be connected, described first inverter thyristor S
1negative electrode and described 4th inverse switch pipe S
4drain electrode be connected and be connected with an input of described output filter circuit 40, described second thyristor S
2negative electrode and described 3rd inverse switch pipe S
3drain electrode be connected and be connected with the another one input of described output filter circuit 40, described 3rd inverse switch pipe S
3source electrode and described 4th inverse switch pipe S
4source electrode be connected and export rectifier diode D with described main anti exciting converter 20 secondary winding Same Name of Ends and described power decoupled converter secondary side
1anode be connected.
Described output filter circuit 40 comprises filter capacitor C
o1with filter inductance L
o; Described filter capacitor C
o1one end and described filter inductance L
oone end be interconnected and be connected with an output of described inverter circuit 30, described filter capacitor C
o1the other end be connected with another output of described inverter circuit 30 and one end of electrical network, described filter inductance L
othe other end be connected with the other end of electrical network.
Described DC side input capacitance C
in, first order filter capacitor C
o, main anti exciting converter active clamp electric capacity C
c2, leakage inductance energy feedback capacitor C
s, power decoupled electric capacity C
c1, filter capacitor C
o1for non-electrolytic capacitor.
When the power output of photovoltaic module is greater than the power output of photovoltaic combining inverter, the power output of described main anti exciting converter 20 through inverter circuit 30 and output filter circuit 40 by Energy Transfer on electrical network, also namely the power output of main anti exciting converter 20 equals the power output of photovoltaic combining inverter; Described power decoupled converter 10 is operated in Buck-Boost pattern, and the surplus power that photovoltaic module exports is stored in described power decoupled electric capacity C
c1in, main anti exciting converter 20 and the power output sum of power decoupled converter 10 equal the power output of solar photovoltaic assembly.
When the power output of photovoltaic module is less than the power output of combining inverter, power outputs all for photovoltaic module is sent to electrical network by described main anti exciting converter 20, described power decoupled converter 10 is operated in anti exciting converter pattern, will be stored in described power decoupled electric capacity C
c1in energy be sent to electrical network, and described main anti exciting converter 20 is sent to the power output that power sum that the power of electrical network and described power decoupled converter 10 be sent to electrical network equals photovoltaic combining inverter in the course of the work.
Described main anti exciting converter transformer T
2leakage inductance energy through described main anti exciting converter active clamping switch tube S
c2with described main anti exciting converter active clamp electric capacity C
c2the branch road formed absorbs feedback; Described power decoupled converter transformer T
1leakage inductance energy when described power decoupled converter 10 is operated in Buck-Boost pattern by described power decoupled converter decoupling switch pipe S
c1, power decoupled electric capacity C
c1the branch road formed absorbs feedback; Described power decoupled converter transformer T
1leakage inductance energy when described power decoupled converter 10 is operated in anti exciting converter pattern through leakage inductance energy feedback capacitor C
s, described DC side input capacitance C
inand described main anti exciting converter main switch S
m2body diode D
m2, body capacitance C
m2feed back to direct-flow input end.
The main feature with the photovoltaic combining inverter of active power decoupling zero function proposed by the invention and technique effect are summarized as follows:
(1) energy that photovoltaic combining inverter exports is split as direct current power part and the AC power part needing decoupling zero by the topology with the photovoltaic combining inverter of active power decoupling zero function proposed and control mode, and transmitted respectively by main anti exciting converter and power decoupled converter, achieve active power decoupling zero, reach the object of power decoupled, complete the target removing the large electrochemical capacitor of direct current input side, solve the shortcoming that photovoltaic combining inverter reliability is low, useful life is short caused owing to there is large electrochemical capacitor.
(2) the main anti exciting converter of photovoltaic combining inverter with active power decoupling zero function proposed and power decoupled converter interlock work, reduce input and output current ripples, are of value to reduction output current harmonics; Electrical isolation is achieved between input and output simultaneously.
(3) the energy high frequency transform coefficients (namely being inputted the ratio of energy by the energy of high frequency conversion and DC side) with the photovoltaic combining inverter of active power decoupling zero function proposed is 1.318, and this is the minimum high frequency transform coefficients realized required for power decoupled.The least possible energy high frequency conversion can reduce to greatest extent because high-frequency energy converts the loss in efficiency brought.
(4) achieve absorption and the feedback of all leakage inductance energies in the photovoltaic combining inverter with active power decoupling zero function, the switching tube of converter primary side no longer needs extra absorption protective circuit; The Sofe Switch of described main anti exciting converter main switch and described main anti exciting converter active clamping switch tube can be realized simultaneously; Improve the power conversion efficiency of photovoltaic combining inverter.
Present invention achieves the power decoupled between photovoltaic combining inverter DC side input power and AC power output, make to adopt the non-electrolytic capacitor of low capacity just can realize the DC voltage-stabilizing effect of photovoltaic module output at photovoltaic combining inverter direct current input side, improve photovoltaic module MPPT maximum power point tracking (MPPT) efficiency; And instead of electrochemical capacitor with the non-electrolytic capacitor that reliability is high, solve a difficult problem for the whole service life shortening that photovoltaic combining inverter causes owing to using electrochemical capacitor; Absorption feedback is achieved to transformer leakage inductance energy in circuit simultaneously, and achieve the Sofe Switch of main anti exciting converter main switch, improve the power conversion efficiency of photovoltaic combining inverter.
Accompanying drawing explanation
Fig. 1 is the photovoltaic combining inverter circuit theory diagrams that the present invention has active power decoupling zero function.
Fig. 2 is that the present invention has the photovoltaic combining inverter of active power decoupling zero function at DC side input power P
pVbe greater than AC power output p
actime circuit working schematic diagram.
Fig. 3 is that the present invention has the photovoltaic combining inverter of active power decoupling zero function at DC side input power P
pVbe less than AC power output p
actime circuit working schematic diagram.
Fig. 4 is the principle schematic that the present invention has each power conversion part of photovoltaic combining inverter groundwork electric current in a grid cycle of active power decoupling zero function.
Fig. 5 is that the main anti exciting converter of photovoltaic combining inverter that the present invention has an active power decoupling zero function realizes leakage inductance energy and absorbs the schematic diagram with high-frequency work switching tube Sofe Switch process.
Fig. 6 is the key operation waveforms schematic diagram of photovoltaic combining inverter in a grid cycle that the present invention has active power decoupling zero.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the photovoltaic combining inverter that the present invention has active power decoupling zero function is described in further detail.
The topological structure with the photovoltaic combining inverter of active power decoupling zero function of the present invention as shown in Figure 1, comprises main anti exciting converter 20, power decoupled converter 10, first order filter capacitor C
o, inverter circuit 30 and output filter circuit 40.The output voltage of photovoltaic module is through a DC side input capacitance C in parallel with photovoltaic module output
into be connected with the input of main anti exciting converter 20, the input of power decoupled converter 10 respectively afterwards, the output of main anti exciting converter 20 and power decoupled converter 10 output be connected to each other and with first order filter capacitor C
oinput connects, first order filter capacitor C
ooutput be connected with the input of inverter circuit 30, the output of inverter circuit 30 is connected with the input of output filter circuit 40.
In the present embodiment, main anti exciting converter 20 comprises main anti exciting converter main switch S
m2(wherein D
m2, C
m2be respectively S
m2body diode and body capacitance), main anti exciting converter transformer T
2, main anti exciting converter secondary side exports rectifier diode D
3, main anti exciting converter active clamping switch tube S
c2, main anti exciting converter active clamp electric capacity C
c2; Power decoupled converter 10 comprises power decoupled converter input diode D
s, leakage inductance energy feedback capacitor C
s, power decoupled converter main switch S
m1(wherein D
m1, C
m1be respectively S
m1body diode and body capacitance), power decoupled converter transformer T
1, power decoupled converter secondary side exports rectifier diode D
1, power decoupled converter secondary side output switch pipe S
d1(D
d1for S
d1body diode), power decoupled converter decoupling switch pipe S
c1, power decoupled electric capacity C
c1; Inverter circuit 30 comprises the first inverter thyristor S
1, the second inverter thyristor S
2, the 3rd inverse switch pipe S
3, the 4th inverse switch pipe S
4; Output filter circuit 40 comprises filter capacitor C
o1with filter inductance L
o.
The output voltage of photovoltaic module is through a DC side input capacitance C in parallel with photovoltaic module output
in, main anti exciting converter transformer T
2first side winding Same Name of Ends and the positive terminal of photovoltaic module output voltage and DC side input capacitance C
inone end and main anti exciting converter active clamping switch tube S
c2drain electrode be connected, main anti exciting converter transformer T
2the non-same polarity of first side winding and anti exciting converter main switch S
m2drain electrode and main anti exciting converter active clamp electric capacity C
c2one end be connected, main anti exciting converter active clamp electric capacity C
c2the other end and main anti exciting converter active clamping switch tube S
c2source electrode be connected, main anti exciting converter main switch S
m2source electrode and DC side input capacitance C
inthe other end and power decoupled converter main switch S
m1source electrode and the negative pole end of photovoltaic module output voltage be connected, main anti exciting converter transformer T
2non-same polarity and the main anti exciting converter secondary side of secondary side winding export rectifier diode D
3anode connect, main anti exciting converter secondary side exports rectifier diode D
3negative electrode and first order filter capacitor C
oone end and power decoupled converter transformer T
1secondary side Same Name of Ends be connected and with the first inverter thyristor S in inverter circuit 30
1anode, the second inverter thyristor S
2anode connect, main anti exciting converter transformer T
2secondary side winding Same Name of Ends and first order filter capacitor C
othe other end and inverter circuit 30 in the 3rd inverse switch pipe S
3source electrode, the 4th inverse switch pipe S
4source electrode connect.Power decoupled converter input diode D
sanode and the positive terminal of photovoltaic array output voltage and leakage inductance energy feedback capacitor C
sone end be connected, power decoupled converter input diode D
snegative electrode and leakage inductance energy feedback capacitor C
sthe other end and power decoupled converter transformer T
1same Name of Ends and power decoupled converter decoupling switch pipe S
c1drain electrode is connected, power decoupled converter transformer T
1the non-same polarity of first side winding and power decoupled converter main switch S
m1drain electrode and power decoupled electric capacity C
c1one end be connected, power decoupled electric capacity C
c1the other end and power decoupled converter decoupling switch pipe S
c1source electrode be connected, power decoupled converter main switch S
m1source electrode and DC side input capacitance C
inthe other end and power decoupled converter main switch S
m1the negative pole end of source electrode and photovoltaic array output voltage is connected, power decoupled converter transformer T
1the non-same polarity of secondary side winding and power decoupled converter secondary side output switch pipe S
d1drain electrode connect, power decoupled converter secondary side output switch pipe S
d1source electrode and power decoupled converter secondary side export rectifier diode D
1negative electrode be connected, power decoupled converter secondary side exports rectifier diode D
1anode and main anti exciting converter T
2secondary winding Same Name of Ends be connected and with the 3rd inverse switch pipe S in inverter circuit 30
3source electrode, the 4th inverse switch pipe S
4source electrode connect, power decoupled converter transformer T
1secondary side winding Same Name of Ends and main anti exciting converter secondary side export rectifier diode D
3negative electrode and inverter circuit 30 in the first inverter thyristor S
1anode, the second inverter thyristor S
2anode connect.First inverter thyristor S in inverter circuit 30
1negative electrode and the 4th inverse switch pipe S
4drain electrode be connected and with the filter capacitor C in output filter circuit 40
o1with filter inductance L
oone end is connected, the second inverter thyristor S
2negative electrode and the 3rd inverse switch pipe S
3drain electrode be connected and with the filter capacitor C in output filter circuit 40
o1the other end and one end of line voltage be connected, the filter inductance L in output filter circuit 40
othe other end is connected with the other end of line voltage.
Power decoupled converter secondary side output switch pipe S in this embodiment
d1, the first inverter thyristor S
1, the second inverter thyristor S
2, the 3rd inverse switch pipe S
3, the 4th inverse switch pipe S
4operating frequency is line voltage frequency, can adopt thyristor or MOSFET during concrete enforcement; Main anti exciting converter main switch S
m2, main anti exciting converter active clamping switch tube S
c2, power decoupled converter main switch S
m1, power decoupled converter decoupling switch pipe S
c1for high-frequency work switching tube, during concrete enforcement, MOSFET can be adopted.
DC side input capacitance C
in, first order filter capacitor C
o, main anti exciting converter active clamp electric capacity C
c2, leakage inductance energy feedback capacitor C
s, power decoupled electric capacity C
c1, filter capacitor C
o1deng being non-electrolytic capacitor.
Grid-connected application is general, and desirably unity power factor is grid-connected, injects electric current and the line voltage same-phase of electrical network.Line voltage, grid-connected current expression formula are respectively:
u
g(t)＝U
g×sin(ω
gt)(1)
i
g(t)＝I
g×sin(ω
gt)(2)
Wherein U
g, I
gbe respectively line voltage peak value and grid-connected current peak value, then the power output of combining inverter is:
Can find out, the power average value injecting electrical network is U
gi
g/ 2, and there is the pulsation of twice power frequency, amplitude is U
gi
g/ 2.And for whole from photovoltaic DC side to grid-connected system, in DC side input is a stable energy, be then the energy of an alternation in net side.Place of matchmakers proposes the course of work with the photovoltaic combining inverter of active power decoupling zero function below.
As DC side input power P
pVbe greater than AC power output p
actime, circuit working process is as shown in Figure 2.There is the main anti exciting converter 20 of the photovoltaic combining inverter of active power decoupling zero function and power decoupled converter 10 to interlock work, main anti exciting converter 20 works in active clamp mode of operation, and the power output of main anti exciting converter 20 equals the power output p of photovoltaic combining inverter
ac, main anti exciting converter transformer T
2place branch road leakage inductance energy is through main anti exciting converter active clamping switch tube S
c2with main anti exciting converter active clamp electric capacity C
c2the branch road formed absorbs feedback, main anti exciting converter active clamping switch tube S
c2with main anti exciting converter main switch S
m2be operated in ZVS state; Power decoupled converter 10 is operated in Buck-Boost mode of operation, power decoupled converter transformer T
1primary side magnetizing inductance, power decoupled converter main switch S
m1, power decoupled converter decoupling switch pipe S
c1body diode, stored energy is to power decoupled electric capacity C
c1form an One Buck-Boost converter body, by (P
pV-p
ac) power storage to power decoupled electric capacity C
c1, power decoupled converter transformer T simultaneously
1the leakage inductance energy of place branch road is stored in power decoupled electric capacity C along with this natural resonance process
c1in.Power decoupled converter decoupling switch pipe S in this process
c1, power decoupled converter secondary side output switch pipe S
d1keep turning off.
As DC side input power P
pVbe less than AC power output p
actime, circuit working process is as shown in Figure 3.Main anti exciting converter 20 and power decoupled converter 10 interlock work.Main anti exciting converter 20 works in active clamp mode of operation, and its power output equals DC side input power P
pV, main anti exciting converter transformer T
2place branch road leakage inductance energy is through main anti exciting converter active clamping switch tube S
c2with main anti exciting converter active clamp electric capacity C
c2the branch road formed absorbs feedback, main anti exciting converter active clamping switch tube S
c2with main anti exciting converter main switch S
m2be operated in ZVS state, as shown in Figure 5; Power decoupled converter 10 is operated in Flyback pattern, power decoupled converter transformer T
1primary side magnetizing inductance, power decoupled converter decoupling switch pipe S
c1, power decoupled electric capacity C
c1, power decoupled converter secondary side output switch pipe S
d1, power decoupled converter secondary side exports rectifier diode D
1form a Flyback converter, power decoupled electric capacity C will be stored in
c1in energy be sent to secondary side, the simultaneously transformer T of power decoupled converter
1the leakage inductance energy of place branch road is through feedback capacitor C
s, DC side input capacitance C
inand main anti exciting converter main switch S
m2body diode D
m2, body capacitance C
m2feed back to DC side input capacitance C
in.Power decoupled converter main switch S in this process
m1keep off state, power decoupled converter secondary side output switch pipe S
d1keep opening state.
At the positive half cycle of line voltage, the first inverter thyristor S in inverter circuit 30
1with the 3rd inverse switch pipe S
3be in opening state, the second inverter thyristor S
2with the 4th inverse switch pipe S
4be in off state; At line voltage negative half period, the first inverter thyristor S in inverter circuit 30
1with the 3rd inverse switch pipe S
3be in off state, the second inverter thyristor S
2with the 4th inverse switch pipe S
4be in opening state.
The power analyzing known high frequency conversion contains the pulsation of twice power frequency, and amplitude is U
gi
g/ 2, this is the minimum power that will realize high frequency conversion required for input-output power decoupling zero, reduces the power loss caused due to HF power conversion.
The photovoltaic combining inverter with active power decoupling zero function proposed by the invention is in practical work process, digitial controller is adopted to realize the control of combining inverter, circuit working is at constant switching frequency discontinuous conduct mode (DCM), peak value comparison method is adopted to make combining inverter output current and line voltage same-phase, realize unity power factor grid-connected, as shown in Figure 4 and Figure 5.
As shown in Figure 6, the key operation waveforms of described photovoltaic combining inverter within a line voltage cycle.With line voltage angular measure, in steady operation situation, the intersection point of Buck-Boost pattern and Flyback pattern is 45 degree and 135 degree (225 degree and 315 degree).
Above content is general principle of the present invention, principal character and major advantage.Technical staff in the industry should understand; the present invention is not by the restriction of above-mentioned embodiment; what describe in above-mentioned example and specification just illustrates principle of the present invention; under the premise without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in claimed and scope of invention.
Claims (7)
1. there is a photovoltaic combining inverter for active power decoupling zero function, it is characterized in that: comprise main anti exciting converter (20), power decoupled converter (10), first order filter capacitor (C
o), inverter circuit (30) and output filter circuit (40); The output voltage of photovoltaic module is through a DC side input capacitance (C in parallel with photovoltaic module output
in) after be connected with the input of main anti exciting converter (20), the input of power decoupled converter (10) respectively, the output of described main anti exciting converter (20) and the output of described power decoupled converter (10) be connected to each other and with first order filter capacitor (C
o) input connect, described first order filter capacitor (C
o) output be connected with the input of inverter circuit (30), the output of described inverter circuit (30) is connected with the input of output filter circuit (40); Described main anti exciting converter (20) comprises main anti exciting converter main switch (S
m2), main anti exciting converter transformer (T
2), main anti exciting converter secondary side exports rectifier diode (D
3), main anti exciting converter active clamping switch tube (S
c2) and main anti exciting converter active clamp electric capacity (C
c2); Described main anti exciting converter transformer (T
2) first side winding Same Name of Ends and the positive terminal of photovoltaic module output voltage and described DC side input capacitance (C
in) one end and described main anti exciting converter active clamping switch tube (S
c2) drain electrode be connected, the transformer (T of described main anti exciting converter
2) the non-same polarity of first side winding and described anti exciting converter main switch (S
m2) drain electrode and described main anti exciting converter active clamp electric capacity (C
c2) one end be connected, described main anti exciting converter active clamp electric capacity (C
c2) the other end and described main anti exciting converter active clamping switch tube (S
c2) source electrode be connected, described main anti exciting converter main switch (S
m2) source electrode and described DC side input capacitance (C
in) the other end and described power decoupled converter main switch (S
m1) source electrode and the negative pole end of photovoltaic module output voltage be connected, described main anti exciting converter transformer (T
2) non-same polarity of secondary side winding and described main anti exciting converter secondary side export rectifier diode (D
3) anode connect, described main anti exciting converter secondary side exports rectifier diode (D
3) negative electrode and described first order filter capacitor (C
o) one end be connected with described power decoupled converter (10) Circuit Fault on Secondary Transformer Same Name of Ends, described main anti exciting converter (20) secondary side winding Same Name of Ends and described first order filter capacitor (C
o) the other end and described inverter circuit (30) connect.
2. the photovoltaic combining inverter with active power decoupling zero function according to claim 1, is characterized in that: described power decoupled converter (10) comprises power decoupled converter input diode (D
s), leakage inductance energy feedback capacitor (C
s), power decoupled converter main switch (S
m1), power decoupled converter transformer (T
1), power decoupled converter secondary side exports rectifier diode (D
1), power decoupled converter secondary side output switch pipe (S
d1), power decoupled converter decoupling switch pipe (S
c1) and power decoupled electric capacity (C
c1); Described power decoupled converter input diode (D
s) anode and the positive terminal of photovoltaic module output voltage and described leakage inductance energy feedback capacitor (C
s) one end be connected, power decoupled converter input diode (D
s) negative electrode and described leakage inductance energy feedback capacitor (C
s) the other end and described power decoupled converter transformer (T
1) Same Name of Ends and described power decoupled converter decoupling switch pipe (S
c1) drain electrode be connected, described power decoupled converter transformer (T
1) the non-same polarity of first side winding and described power decoupled converter main switch (S
m1) drain electrode and described power decoupled electric capacity (C
c1) one end be connected, described power decoupled electric capacity (C
c1) the other end and described power decoupled converter decoupling switch pipe (S
c1) source electrode be connected, described power decoupled converter main switch (S
m1) source electrode and described DC side input capacitance (C
in) the other end and described main anti exciting converter main switch (S
m2) source electrode and the negative pole end of photovoltaic module output voltage be connected, described power decoupled converter transformer (T
1) non-same polarity of secondary side winding and described power decoupled converter secondary side output switch pipe (S
d1) drain electrode connect, described power decoupled converter secondary side output switch pipe (S
d1) source electrode and power decoupled converter secondary side export rectifier diode (D
1) negative electrode be connected, described power decoupled converter secondary side exports rectifier diode (D
1) anode be connected with described main anti exciting converter (20) secondary winding Same Name of Ends, described power decoupled converter transformer (T
1) secondary side winding Same Name of Ends and described main anti exciting converter secondary side export rectifier diode (D
3) negative electrode and described inverter circuit (30) connect.
3. the photovoltaic combining inverter with active power decoupling zero function according to claim 1, is characterized in that: described inverter circuit (30) comprises the first inverter thyristor (S
1), the second inverter thyristor (S
2), the 3rd inverse switch pipe (S
3) and the 4th inverse switch pipe (S
4); Described first inverter thyristor (S
1) anode and described second inverter thyristor (S
2) anode link together and with first order filter capacitor (C
o) one end be connected, described first inverter thyristor (S
1) negative electrode and described 4th inverse switch pipe (S
4) drain electrode be connected and be connected with an input of described output filter circuit (40), described second inverter thyristor (S
2) negative electrode and described 3rd inverse switch pipe (S
3) drain electrode be connected and be connected with the another one input of described output filter circuit (40), described 3rd inverse switch pipe (S
3) source electrode and described 4th inverse switch pipe (S
4) source electrode be connected and export rectifier diode (D with described main anti exciting converter (20) secondary winding Same Name of Ends and described power decoupled converter secondary side
1) anode be connected.
4. the photovoltaic combining inverter with active power decoupling zero function according to claim 1, is characterized in that: described output filter circuit (40) comprises filter capacitor (C
o1) and filter inductance (L
o); Described filter capacitor (C
o1) one end and described filter inductance (L
o) one end be interconnected and be connected with an output of described inverter circuit (30), described filter capacitor (C
o1) the other end be connected with another output of described inverter circuit (30) and one end of electrical network, described filter inductance (L
o) the other end be connected with the other end of electrical network.
5. the photovoltaic combining inverter with active power decoupling zero function according to claim 2, it is characterized in that: when the power output of photovoltaic module is greater than the power output of photovoltaic combining inverter, the power output of described main anti exciting converter (20) through inverter circuit (30) and output filter circuit (40) by Energy Transfer on electrical network, also namely the power output of main anti exciting converter (20) equals the power output of photovoltaic combining inverter, described power decoupled converter (10) is operated in Buck-Boost pattern, the surplus power that photovoltaic module exports is stored in described power decoupled electric capacity (C
c1) in, main anti exciting converter (20) equals the power output of photovoltaic module with the power output sum of power decoupled converter (10).
6. the photovoltaic combining inverter with active power decoupling zero function according to claim 2, it is characterized in that: when the power output of photovoltaic module is less than the power output of combining inverter, the power that all photovoltaic modulies export is sent to electrical network by described main anti exciting converter (20), described power decoupled converter (10) is operated in anti exciting converter pattern, will be stored in described power decoupled electric capacity (C
c1) in energy be sent to electrical network; Described main anti exciting converter (20) is sent to the power output that power sum that the power of electrical network and described power decoupled converter (10) be sent to electrical network equals photovoltaic combining inverter.
7. the photovoltaic combining inverter with active power decoupling zero function according to claim 1, is characterized in that, described main anti exciting converter transformer (T
2) leakage inductance energy through described main anti exciting converter active clamping switch tube (S
c2) and described main anti exciting converter active clamp electric capacity (C
c2) branch road that forms absorbs feedback; Described power decoupled converter transformer (T
1) leakage inductance energy when described power decoupled converter (10) is operated in Buck-Boost pattern by described power decoupled converter decoupling switch pipe (S
c1), power decoupled electric capacity (C
c1) branch road that forms absorbs feedback; Described power decoupled converter transformer (T
1) leakage inductance energy when described power decoupled converter (10) is operated in anti exciting converter pattern through leakage inductance energy feedback capacitor (C
s), described DC side input capacitance (C
in) and described main anti exciting converter main switch (S
m2) body diode (D
m2), body capacitance (C
m2) feed back to direct-flow input end.
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| CN106787873B (en) * | 2017-03-01 | 2023-06-30 | 华东交通大学 | Alternating current side coupled power decoupling circuit |
| CN107990412A (en) * | 2017-11-22 | 2018-05-04 | 深圳市中航三鑫光伏工程有限公司 | Photovoltaic air purifier |
| CN108599134B (en) * | 2018-04-24 | 2020-04-21 | 中南民族大学 | Variable capacitor circuit for smart grid and implementation method |
| CN115995986B (en) * | 2023-03-24 | 2023-06-09 | 安徽微伏特电源科技有限公司 | Series-parallel flyback boost circuit topology with triangular structure |
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| CN202167862U (en) * | 2011-07-05 | 2012-03-14 | 浙江昱能光伏科技集成有限公司 | Grid-connected solar photovoltaic staggered parallel flyback inverter |
| CN102522766B (en) * | 2011-11-04 | 2014-12-24 | 浙江昱能科技有限公司 | Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof |
| CN102570891B (en) * | 2012-01-16 | 2014-08-13 | 浙江昱能光伏科技集成有限公司 | Flyback photovoltaic grid-connected inverter adopting interleaving parallel-connection active clamping technology |
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Address after: Four Shaanxi high tech Zone Shanglinyuan road 710119 Xi'an City No. 70 Patentee after: TBEA SunOasis Co.,Ltd. Patentee after: TBEA Xinjiang New Energy Co., Ltd. Address before: 830011 No. 399 South Changchun Road, the Xinjiang Uygur Autonomous Region, Urumqi Patentee before: TBEA Xinjiang New Energy Co., Ltd. Patentee before: TBEA SunOasis Co.,Ltd. |